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java.io.NotSerializableException: com.hbfinance.DataframeExample
Serialization stack:
    - object not serializable (class: com.hbfinance.DataframeExample, value: com.hbfinance.DataframeExample@1f3165e7)
    - field (class: com.hbfinance.DataframeExample$1, name: this$0, type: class com.hbfinance.DataframeExample)
    - object (class com.hbfinance.DataframeExample$1, com.hbfinance.DataframeExample$1@1866da85)
    - field (class: org.apache.spark.api.java.JavaPairRDD$$anonfun$toScalaFunction$1, name: fun$1, type: interface org.apache.spark.api.java.function.Function)
    - object (class org.apache.spark.api.java.JavaPairRDD$$anonfun$toScalaFunction$1, <function1>)	at org.apache.spark.serializer.SerializationDebugger$.improveException(SerializationDebugger.scala:40)	at org.apache.spark.serializer.JavaSerializationStream.writeObject(JavaSerializer.scala:47)	at org.apache.spark.serializer.JavaSerializerInstance.serialize(JavaSerializer.scala:84)	at org.apache.spark.util.ClosureCleaner$.ensureSerializable(ClosureCleaner.scala:301)	at org.apache.spark.util.ClosureCleaner$.org$apache$spark$util$ClosureCleaner$$clean(ClosureCleaner.scala:294)	at org.apache.spark.util.ClosureCleaner$.clean(ClosureCleaner.scala:122)	at org.apache.spark.SparkContext.clean(SparkContext.scala:2021)	at org.apache.spark.rdd.RDD$$anonfun$map$1.apply(RDD.scala:314)	at org.apache.spark.rdd.RDD$$anonfun$map$1.apply(RDD.scala:313)	at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:147)	at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:108)	at org.apache.spark.rdd.RDD.withScope(RDD.scala:306)	at org.apache.spark.rdd.RDD.map(RDD.scala:313)	at org.apache.spark.api.java.JavaRDDLike$class.map(JavaRDDLike.scala:93)	at org.apache.spark.api.java.AbstractJavaRDDLike.map(JavaRDDLike.scala:47)	at com.hbfinance.DataframeExample.run(DataframeExample.java:54)	at com.hbfinance.DataframeExample.main(DataframeExample.java:88)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:672)	at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:180)	at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:205)	at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:120)	at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)